Wrench.



No. 864,806. PATENTED SEPT. s, '1907.

M. SGHWENDNER.

WRENCH.

PPLIonIoN FILED rmx. e. 1907.

M. 6mm,

MAX SGHWENDNER, OF READING, PENNSYLVANIA.

WRENCH.

Specification of Letters Patent.

Patented Sept. 3, 1907.

Application filed February 6,1907. Serial No. 355,988.

To all whom it may concern:

Be it known that I, MAX SeHwnNnNnn, a citizen oi the United States oi America, and a resident of Reading, in the county of Berks and State of Pennsylvania,` have invented certain new and useful lmprovements in Wrenches, of which the following is a specification This invention relates to certain new and useful improvements in wrenches oi that class embodying a movable jaw mounted for rocking movement on the shank oi the stationary jaw, with a spring disposed within a recess of the movable jaw and acting against the shank oi the stationary jaw.

rhe present invention has ior its objects among others to provide an improved wrench 0i' this general character which shall be simple and cheap, yet durable and efficient in use.

It has for a further object to provide such a conrstuction that when the parallel portions of the shank and the movable jaw are held in parallel rela-tion the wrench is securely locked in its adjusted position. The distance between the acting toothed face oi the movable jaw and the acting portion oi the opposite portion and of the guide pin is tlie same as the width of the shank of the stationary jaw, so that when the movable jaw has been adjusted and its teeth are engaged in the teeth on the shank of the stationary jaw the parts are held in parallelism and the movable jaw lirmly locked against movement. This arrangement further relieves the movablejaw of the strain and also of the wear, the latter' coming on the shank of the stationary jaw.

The movable jaw is lformed with a curved portion forming a thumb rest by which the movable jaw may be easily moved to its required position. This may be serrated if desired to insure a better hold.

The spring within a cavity of the movable jaw is held in place and rendered adjustable by means oi a screw which extends from the outside of the jaw and accessible from the outside for the purpose of adjustment or removal, as may be desired.

The acting face oi the stationary jaw is slightly inclined from a right angle to the face of the shank so as to provide a tapered opening between the jaws, which insures a'firm, solid grip on the nut or other article, and prevents slipping and all lost motion.

The teeth are made very iine so as to provide accurate adjustment, and the movable jaw is so easily movable as to permit et ready adjustment by the thumb while handling the wrench with the hand.

'Other objects and advantages of the invention will hereinafter appear and the novel features thereof will be speciiically dened by the appended claims.

The invention is clearly illustrated in the accompanying drawings, which, with the numerals of reference marked thereon, form a part oi this specilication, and in which Figure l is a perspective view of my improved wrench. Fig. 2 is an enlarged detail partly in elevation and partly in longitudinal section. Fig. 3 is a perspective view, on an enlarged scale,` oi the movable jaw removed from the shank.

Like numerals of reference indicate like parts throughout the several views.

Referring to the drawings, l. designates the shank of the stationary jaw, having the parallel-sided rectangular portion 2 integral with one end oi which is the stationary jaw 3. This rectangular ,portion 2 is l'ormed with a shoulder 4 lor a purpose which will be hereinafter made clear. One face oi the rectangular portion 2 is toothed, as at 5, the teeth being fine so as to permit ol" very accurate adjustment. The acting iace oi the jaw 3 is slightly beveled or inclined with relation to a right angle lfrom the face 7 oi the rectangular portion 2, as seen at 6 in Fig. 2, lor a purpose which will hereinafter appear. i

8 is the movable jaw. lts acting lace 9 is exactly at right angles to its face l0 Mwhich is provided with iine teeth ll., as shown, for coperation with the teeth 5 el' the rectangular portion 2 oi the shank l. This face l() is upon a portion'l2 which extends beyond the lace oi the jaw 9, the shoulder 13 serving as a stop to engage the shoulder 14 upon the inner lace ol the jaw 3. The movable jaw is lormed with a recess l5 within which is the abutment 16, against which latter bears one end oi a spring 17, the other end oi which is designed to bear against the outer face ol the portion 2 of the shank, the said spring being detachably and adjustably held in position by means oi the screw 1S which is inserted irom the outer face of the jaw, with its inner end bearing against said sp1-ing opposite said abutment, as shown clearly in Fig. 2. By this means the spring is readily controlled from the exterior oi the jaw, and suiiicient loosening oi this screw permits oi the withdrawal or removal of the spring, the iree end of which normally would engage the shoulder l and prevent separation oi the movable jaw i'roni the shank oi the fixed jaw, but wh en this spring is remo ved the movable jaw can be removed, and again replaced, or a new one ii necessary putin position, the spi-ing'inserted and secured by the screw. The opposite side oi the movable jaw is recessed, as shown at 19, and within this recess is the guide and stop pin 20, integral with the jaw, as seen in Fig. 3 and which serves an important function in the operation oi' the wrench, as will soon be described. A space or opening 2l is provided between the acting iace oi the movable jaw and the adjacent lace of the shank portion 2, as seen best in Fig. 2, to permit oi the necessary rocking movement oi the movable jaw.

As will be seen from Fig. 2, a line drawn through the acting portion ot' the pin 20 and face 22 will be parallel with the iace l0, and the distance between this line and the said lace l0 will be the same as the distance from side to side of the portion 2 of the shank. By this means when the parts are in the position shown in Fig. 2, the movable jaw is locked and any strain or pressure upon its acting iace only tends to more securely hold it against movement because the greater the. strain or pressure the more .tirmly will the iaces l0 and 4227 and the pin 20 be held against the shank portion 2.

The mode of use will be apparent. Pressure with the thumb upon the concave portion 23 of the movable jaw, which concaved portion being preferably serrated, as shown, to provide better irictional engagement oi the thumb, serves to rock the movable jaw, when the latter can be easily moved by the thumb in either direction. The tapered space between the acting faces of the two jaws serves to aii'ord a better hold upon the nut or other article and compensates for any lost motion there may be in the movable jaw.

'lhe disposition of the parts whereby the parallelism oi the laces l0 and 22 and the pin 20 is maintained to constitute a rigid lock or the movable jaw when the teeth are in engagement is oi' prime importance. @Modifications in detail may be resorted to without departing trom the spirit oi the invention or sacrificing any of its advantages.

What l claim as new is l. In a wrench, a stationary jaw and its shank, and a movable jaw on said shank, the cooperating; faces of the movable jaw and shank being toothed, the said movable jaw being recessed and provided with a guide and locking pin, the opposite acting faces of the movable jaw and the acting face of said pin being parallel, whereby when they are in engagement with said shank the movable jaw is locked against movement.

2, ln a wrench, a stationary jaw and its shank, and a movable jaw on said shank, the said movable jaw being recessed and provided with a guide and locking pin, the opposite acting faces of the movable jaw and the acting face of said pin being parallel, whereby' when they are in engagement with said shank the movable jaw is locked against movement, one of said acting faces of the movable jaw being toothed to engage cooperating teeth on said shank.

3. ln a wrench, a stationary jaw, its shank having a rectangular portion with one face provided with fine teeth, and a movable jaw having acting faces parallel with said shank, and a guiding and locking pin, the said pin and one acting face of the jaw being parallel with the other acting face, the distance between them being the same as the width of the rectangular portion of the shank, said movable jaw being mounted for rocking movement on said rectangular portion.

4. In a wrench, a stationary jaw having a beveled acting face, the shank of said jaw, a movable jaw on said shank, the said movable jaw heilig recessed and provided with a guide and a locking pin and with a. right angled acting face, the opposite acting faces of the movable jaw and the acting face oi said pin being parallel with each other and with the faces of said shank, whereby when they are in engagement with said shank the movable jaw is locked against movement.

5. In a wrench, a shank and a stationary jaw thereon, a movable jaw mounted for rocking movement on said shank and having a chamber with abutment, a spring in said chamber with one end seated on said abutment, and a screw adjustable in said jaw with one end bearing against the end of the spring and securing it to said abutment, the other end'of said screw being accessible from the outside of said jaw.

Signed by me at Reading Penna. this 1st day of February 1907.

/ MAX SCHWENDNER.

Witnesses z Minimi WERNER, CHARLES R. WERNER. 

